Measuring and controlling panel singulation shock

Details Measuring and controlling panel singulation shock Measuring and controlling panel singulation shock

1996-10-18

1998-03-03

Williams, Hezron E.

Measuring and testing

Testing of apparatus

29829, 29830, 73801, 73587, G01N 1900

Patent

active

057237980

ABSTRACT:
A panel of several circuit boards connected by bridges is separated into individual boards by opposed dies which sever the link. Shock from the die impact can damage fragile components mounted on the circuit boards, especially when dies become dull and the singulation machine needs to be serviced. Periodic measurements of die acceleration and panel acceleration are made during a die wear cycle to obtain an empirical function of the correlation of those parameters. A threshold of acceptable panel acceleration is established and the related limit of die acceleration is determined from the correlation function. Die acceleration is then monitored during a production run to predict when machine servicing is needed.

REFERENCES:
patent: 4208895 (1980-06-01), Grigorenko et al.
patent: 4633720 (1987-01-01), Dybel et al.
patent: 4791721 (1988-12-01), Anderson et al.
patent: 4901575 (1990-02-01), Bohannan et al.
patent: 5184517 (1993-02-01), Kelzer

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